I’ve never been able to get Photostructure to import or even touch my Mac Photos App Library. I don’t think we ever determined 100% if this was a bug due to something particular to my system configuration (which isn’t anything special) or if it just wasn’t supported by Photostructure yet.
The next release adjusts what directories are “ignorable” to not match the folder structure you’ve shared with me.
There’s also a new “sync report” generated whenever PhotoStructure synchronizes a file or directory, which would have made debugging this issue much easier on the first place…